Seiko Monster SRP313J1vsSpinnaker Cahill Automatic

lug2lug doesn't sell watches. Buy links open the brand's or seller's own site. Some links are affiliate links: lug2lug may earn a commission at no extra cost to you. Disclosures

Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Seiko Monster SRP313J1 at true scale

Monster SRP313J1

Spinnaker Cahill Automatic at true scale

Cahill Automatic

Diameter

42mm

42mm

Lug-to-Lug

n/a

51mm

Thickness

n/a

13.7mm

Water Resistance

200m

200m

MSRP

$450

$350

lowest

Movement

Seiko 4R36

Seiko NH35

Case

5 specs
Thickness
n/a
13.7mm
Lug-to-Lug
n/a
51mm
Lug Width
n/a
22mm
Material
Stainless Steel
316L Stainless Steel
Caseback
Solid
n/a

Crystal & Dial

4 specs
Crystal
Hardlex
Sapphire
Crystal Shape
Flat
n/a
Dial Color
Black
Green
Indices
Applied
n/a

Movement

2 specs
Caliber
Seiko 4R36
Seiko NH35
Beat Rate
21,600 vph
0 vph

Pricing

1 specs
MSRP
$450
$350
Keep your wishlist and collection together in the appExplore the app

Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seiko Monster SRP313J1

The Seiko Monster SRP313J1 is praised for its updated 4R36 movement offering hacking and hand-winding, and its bright LumiBrite lume. One owner notes their watch runs at +480 seconds per day. Another owner finds the "teeth indices" of second-generation Monsters more fitting to the "monstrous" aesthetic, considering the SRP313J1 sleeker. On balance, owners and reviewers find the Seiko Monster SRP313J1 appealing for its modern movement features and strong lume, though aesthetic preferences vary.

Spinnaker Cahill Automatic

Owners widely praise the Spinnaker Cahill Automatic for its attractive design and good value, particularly when purchased at a discount. Its 42mm size is considered ideal for smaller wrists, and the NATO strap is a favored feature. Timekeeping is generally found to be solid, with one owner noting excellent accuracy comparable to Seikos. The maxi indices are also appreciated for legibility. However, some owners express concerns about quality control and finishing for the price, with one reporting internal component failures in two separate watches. Other noted compromises include uneven lume and the use of a mineral crystal. Overall, owners and reviewers rate the Spinnaker Cahill Automatic well for its attractive design and value, especially when found at a discount.